Lung recruitmentedfb5d50-1ca5-4bd7-9d4… · Open lung approach for the acute respiratory distress...

Lung recruitmentThis bibliography is a literature reference for users and represents selected relevant publications, without anyclaim to completeness.

Table of Contents

1 Personalised mechanical ventilation tailored to lung morphology versus low positive end-expiratorypressure for patients with acute respiratory distress syndrome in France (the LIVE study): a multicen-tre, single-blind, randomised controlled trial....................................................................................... 3

2 Effect of lung recruitment and titrated positive end-expiratory pressure (PEEP) vs. low PEEP on mor-tality in patients with acute respiratory distress syndrome: A randomized clinical trial. ........................ 5

3 Effect of intensive vs moderate alveolar recruitment strategies added to lung-protective ventilationon postoperative pulmonary complications: a randomized clinical trial ............................................... 7

4 Open lung approach for the acute respiratory distress syndrome: A pilot, randomized controlled trial 8

5 How large is the lung recruitability in early acute respiratory distress syndrome: a prospective caseseries of patients monitored by computed tomography...................................................................... 9

6 Optimal duration of a sustained inflation recruitment maneuver in ARDS patients.............................. 10

7 Prone position and recruitment manoeuvre: the combined effect improves oxygenation .................... 11

8 Clinical efficacy and safety of recruitment maneuver in patients with acute respiratory distress syn-drome using low tidal volume ventilation: a multicentre randomized controlled clinical trial ............... 12

9 A recruitment maneuver increases oxygenation after intubation of hypoxemic intensive care unitpatients: a randomized controlled study ............................................................................................. 13

10 Reversibility of lung collapse and hypoxemia in early acute respiratory distress syndrome ................... 14

11 Lung recruitment in patients with the acute respiratory distress syndrome.......................................... 15

12 Lung computed tomography during a lung recruitment maneuver in patients with acute lung injury.. 16

13 Effects of recruiting maneuvers in patients with acute respiratory distress syndrome ventilated withprotective ventilatory strategy ............................................................................................................ 17

14 Effect of Intraoperative High Positive End-Expiratory Pressure (PEEP) With Recruitment Maneuvers vsLow PEEP on Postoperative Pulmonary Complications in Obese Patients: A Randomized Clinical Trial . 18

15 Recruitment maneuvers: using transpulmonary pressure to help Goldilocks........................................ 19

16 Impact of recruitment on static and dynamic lung strain in acute respiratory distress syndrome.......... 20

17 Volume delivered during recruitment maneuver predicts lung stress in acute respiratory distress syn-drome ............................................................................................................................................... 21

18 Sigh in supine and prone position during acute respiratory distress syndrome .................................... 21

19 Maximal Recruitment Open Lung Ventilation in Acute Respiratory Distress Syndrome (PHARLAP): APhase II, Multicenter, Randomized, Controlled Trial ............................................................................ 22

20 Opening pressures and atelectrauma in acute respiratory distress syndrome....................................... 23

21 A positive response to a recruitment maneuver with PEEP titration in patients with ARDS, regardlessof transient oxygen desaturation during the maneuver....................................................................... 24

22 Safety and efficacy of a sustained inflation for alveolar recruitment in adults with respiratory failure .. 25

23 Changes in shunt, ventilation/perfusion mismatch, and lung aeration with PEEP in patients withARDS: a prospective single-arm interventional study........................................................................... 26

24 Bedside assessment of the effects of positive end-expiratory pressure on lung inflation and recruit-ment by the helium dilution technique and electrical impedance tomography .................................... 27

25 Lung recruitment assessed by respiratory mechanics and computed tomography in patients withacute respiratory distress syndrome. What is the relationship? ........................................................... 28

26 Dynamics of end expiratory lung volume after changing positive end-expiratory pressure in acute res-piratory distress syndrome patients..................................................................................................... 29

27 Acute physiologic effects of a stepwise recruitment maneuver in acute respiratory distress syndrome. 29

28 Acute hemodynamic effects of recruitment maneuvers in patients with acute respiratory distress syn-drome................................................................................................................................................ 30

29 Intercomparison of recruitment maneuver efficacy in three models of acute lung injury ..................... 30

Pediatric patients................................................................................................................................ 31

30 Respiratory and hemodynamic effects of a stepwise lung recruitment maneuver in pediatric ARDS: afeasibility study .................................................................................................................................. 31

31 The safety and efficacy of sustained inflations as a lung recruitment maneuver in pediatric intensivecare unit patients ............................................................................................................................... 32

32 Comparison of 2 lung recruitment strategies in children with acute lung injury .................................. 33

33 Lung aeration changes after lung recruitment in children with acute lung injury: a feasibility study .... 34

Additional files ................................................................................................................................... 35

34 The Nature of Recruitment and Derecruitment and its Implications for Management of ARDS............ 35

35 Recruitment maneuvers and higher PEEP, the so-called open lung concept, in patients with ARDS ..... 35

36 Lung recruitment maneuvers for adult patients with acute respiratory distress syndrome. A system-atic review and meta-analysis. ............................................................................................................ 36

37 Lung Recruitment Maneuvers for ARDS Patients: A Systematic Review and Meta-Analysis .................. 36

38 Recruitment maneuvers and PEEP titration ......................................................................................... 37

39 Lung recruitment in acute respiratory distress syndrome: what is the best strategy? ........................... 37

40 Recruitment maneuvers for acute lung injury: a systematic review...................................................... 38

Hamilton Medical | Bibliography 3

Personalised mechanical ventilation tailored to lung morphology versus low positive end-expiratory pressure for patients with acute respiratory distress syndrome in France (the LIVEstudy): a multicentre, single-blind, randomised controlled trial

Constantin JM, Jabaudon M, Lefrant JY, Jaber S, Quenot JP, Langeron O, Ferrandière M, Grelon F, Seguin P, IchaiC, Veber B, Souweine B, Uberti T, Lasocki S, Legay F, Leone M, Eisenmann N, Dahyot-Fizelier C, Dupont H,Asehnoune K, Sossou A, Chanques G, Muller L, Bazin JE, Monsel A, Borao L, Garcier JM, Rouby JJ, Pereira B,Futier E; AZUREA Network.Lancet Respir Med. 2019 Oct;7(10):870-880PMID 31399381, http://www.ncbi.nlm.nih.gov/pubmed/31399381

Design Multicentre (in 20 university or non-university intensive care units in France), single-blind,stratified, parallel-group, randomised controlled trial: In the control group, patients received atidal volume of 6 ml/kgPBW, PEEP was selected according to a low PEEP/FiO2 table, and earlyprone position was encouraged. In the personalised group, the treatment approach wasbased on lung morphology; patients with focal ARDS received a tidal volume of 8 ml/kg, lowPEEP, and prone position. Patients with non-focal ARDS received a tidal volume of 6 ml/kg,along with recruitment manoeuvres and high PEEP.

Patients 420 patients with moderate-to-severe ARDS for less than 12 h were randomly assigned toeither the control group or the personalised group

Objectives Test whether a mechanical ventilation strategy personalised to individual patients’ lung morphology (low PEEP, high tidal volume, and early prone position for focal ARDS andrecruitment manoeuvres and high PEEP for non-focal ARDS) would improve the survival ofpatients with ARDS in comparison to the well established low-PEEP strategy

Main Results Eleven patients in the personalised group and nine patients in the control group wereexcluded; 196 patients in the personalised group and 204 in the control group were includedin the analysis. In a multivariate analysis, there was no difference in 90-day mortality betweenthe group. However, misclassification of patients as having focal or non-focal ARDS by theinvestigators was observed in 85 (21%) of 400 patients. There was a significant interactionbetween misclassification and randomised group allocation with respect to the primary outcome (p<0·001). In the subgroup analysis, the 90-day mortality of the misclassifiedpatients was higher in the personalised group (26 [65%] of 40 patients) than in the controlgroup (18 [32%] of 57 patients.

Conclusion Personalisation of mechanical ventilation did not decrease mortality in patients with ARDS,possibly because of the misclassification of 21% of patients. A ventilator strategy misalignedwith lung morphology substantially increases mortality. Whether improvement in ARDS phenotyping can decrease mortality should be assessed in a future study.


HR 0.94, 95% CI 0.56-1.57;p=0.81

Time after inclusion (days)

Pro

babili

ty o

f su

rviv

al (%

)

HR 1.04, 95% CI 0.89-1.21;p=0.62

Number at risk

Focal correctly classified

Focal misclassified

Non-focal correctly classified

Non-focal misclassified

51

6

96

51

42

6

73

39

42

5

68

35

41

2

68

32

100

80

60

40

20

00 30 60 90

C Control group (n=204)


Focal misclassified



HR 1.39, 95% CI 1.18-1.64;p=0.001

Time after inclusion (days)

Pro

babili

ty o

f su

rviv

al (%

)

HR 2.03, 95% CI 1.58-2.63;p<0.001

Number at risk


Focal misclassified



67

9

89

31

61

2

74

14

58

2

71

13

56

1

71

13

100

80

60

40

20

00 30 60 90

D Personalised group (n=196)


Focal misclassified or misaligned


Non-focal misclassified or misaligned

Figure 1: High mortality was observed among the misclassified

patients for whom the misaligned ventilator strategy was applied.

Analysis of patients whose lung morphology was correctly classified

at inclusion revealed a significant increase in survival for those in the

personalised group. This finding suggests that misclassification of

lung morphology might have concealed a potential beneficial effect

of personalised mechanical ventilation on survival


Effect of lung recruitment and titrated positive end-expiratory pressure (PEEP) vs. lowPEEP on mortality in patients with acute respiratory distress syndrome: A randomizedclinical trial.

Writing group for the alveolar recruitment for acute respiratory distress syndrome trial (ART) Investigators, Caval-canti AB, Suzumura ÉA, Laranjeira LN, Paisani DM, Damiani LP, Guimarães HP, Romano ER, Regenga MM,Taniguchi LNT, Teixeira C, Pinheiro de Oliveira R, Machado FR, Diaz-Quijano FA, Filho MSA, Maia IS, Caser EB,Filho WO, Borges MC, Martins PA, Matsui M, Ospina-Tascón GA, Giancursi TS, Giraldo-Ramirez ND, Vieira SRR,Assef MDGPL, Hasan MS, Szczeklik W, Rios F, Amato MBP, Berwanger O, Ribeiro de Carvalho CR.JAMA. 2017 Oct 10;318(14):1335-1345PMID 28973363, http://www.ncbi.nlm.nih.gov/pubmed/28973363

Design Multicenter, randomized trial conducted at 120 ICU, 9 countries

Patients 1010 moderate to severe ARDS

Objectives Determine if RM (recruitment maneuver) with PEEP titration according to the best respiratory-system compliance decreases 28-day mortality

Main Results Experimental group strategy had an increase in 6-month mortality (65.3% vs. 59.9%; p =0.04), a decrease in the number of mean ventilator-free days (5.3 vs. 6.4; p = 0.03), and anincrease in the risk of barotrauma and in the risk of pneumothorax requiring drainage. Therewere no significant differences in the length of ICU stay, length of hospital stay, ICU mortal-ity, and in-hospital mortality.

Conclusion Without a prior recruitability assessment, a strategy of lung recruitment and titrated PEEPincreased 28-day all-cause mortality compared with low PEEP.

Comment A lot of limitations: - COPD and emphysema were not contraindicated and they have anincreased risk of pneumothorax - Recruitability was not assessed before the RM and most ofthe patients (>60%) had a pulmonary ARDS (usually less recruitable), the ART trial did notdistinguish between responders and non-responders - The staircase RM is a prolongedincrease in pressure with high level of pressure. A mean reduction in driving pressure of only2 cmH2O was found, indicating that the recruitment maneuver was inadequate to open upthe lung and increase functional residual capacity in most patients. - Mortality is 60% vs. sup-posed 36% - Only 10% of the patients were in prone position - Inclusion from november2011 to April 2017 = 66 month i.e 3 patients /month with 120 ICU - Double triggering andbreath stacking was very likely common due to tidal volumes <6ml/kg - Patients were evalu-ated under a standardized ventilator setting using PEEP ≥10 and FiO2 = 1 for 30 min. Onlypatients with a persistent PaO2/FiO2 ≤200 were eligible for randomization.


Days after randomization

0 4 8 12 16 20 24 28

0

40

20

60

80

Mort

alit

y, %

Hazard ratio, 1.20 (95% CI, 1.01-1.42); P=.041

Low PEEP

Lung recruitmentand titrated PEEP

Figure 2: Kaplan Meier curve shows an increase in mortality in RM

group


Effect of intensive vs moderate alveolar recruitment strategies added to lung-protectiveventilation on postoperative pulmonary complications: a randomized clinical trial

Costa Leme A, Hajjar LA, Volpe MS, Fukushima JT, De Santis Santiago RR, Osawa EA, Pinheiro de Almeida J, Ger-ent AM, Franco RA, Zanetti Feltrim MI, Nozawa E, de Moraes Coimbra VR, de Moraes Ianotti R, Hashizume CS,Kalil Filho R, Auler JO Jr, Jatene FB, Gomes Galas FR, Amato MBJAMA. 2017 Apr 11;317(14):1422-1432PMID 28322416, http://www.ncbi.nlm.nih.gov/pubmed/28322416

Design Prospective randomized trial: intensive (high-pressure recruitment maneuver and PEEP = 13 cmH2O) or moderate (low-pressure recruitment maneuver and PEEP = 8 cmH2O) recruitment strategy

Patients 320 hypoxemic patients after cardiac surgery

Objectives Assess the effect of an intensive alveolar recruitment strategy on postoperative pulmonarycomplications in patients receving lung-protective ventilation with small tidal volumes

Main Results The intensive recruitment strategy group had a mean 1.8 (1.7-2.0) and a median 1.7(1.0-2.0) pulmonary complications score versus 2.1 (2.0-2.3) and 2.0 (1.5-3.0) for the moderate strategy group. The mean hospital stay for the intensive group was 10.9 days versus 12.4 days in the moderate group (p = 0.04). The mean ICU stay for the intensive groupwas 3.8 days versus 4.8 days for the moderate group (p = 0.01). Hospital mortality was 2.5%in the intensive group versus 4.9% in the moderate group (p > 0.05).

Conclusion Among patients with hypoxemia after cardiac surgery, the use of an intensive alveolar recruitment strategy resulted in fewer severe pulmonary complications than a moderate recruitment strategy.

Comment This study assesses the effect of an intensive recruitment strategy on complications in post-cardiac surgery patients

Intensive recruitmentstrategy (n=157)

3 55

41 79 35 8

75 20 4

Moderate recruitmentstrategy (n=163)

Modified score of pulmonary complications

Grade 0(no symptoms)

Grade 1 Grade 2

Grade 3 Grade 4 Grade 5(death)

Patients, %

0 20 40 60 80 100

Figure 3: The severity and occurrence of postoperative pulmonary

complications were reduced by use of an intensive recruitment strat-

egy


Open lung approach for the acute respiratory distress syndrome: A pilot, randomizedcontrolled trial

Kacmarek RM, Villar J, Sulemanji D, Montiel R, Ferrando C, Blanco J, Koh Y, Soler JA, Martínez D, Hernández M,Tucci M, Borges JB, Lubillo S, Santos A, Araujo JB, Amato MB, Suárez-Sipmann FOpen Lung Approach Network. Crit Care Med. 2016 Jan;44(1):32-42PMID 26672923, http://www.ncbi.nlm.nih.gov/pubmed/26672923

Design Prospective, multicenter, pilot, randomized controlled trial

Patients 200 moderate to severe early onset ARDS

Objectives Compared the ARDSnet protocol using low levels of PEEP with open lung approach (OLA = recruitment maneuver and decremental PEEP trial based on the best compliance)

Main Results Mortality at day 60 (29% OLA vs. 33% ARDSnet protocol, p=0.18), ICU mortality (25% OLAvs. 30% ARDSnet protocol, p = 0.53), and ventilator-free days (8 [0-20] OLA vs. 7 [0-20] dARDSnet protocol, p = 0.53) were not significantly different. Airway driving pressure and PaO2/FIO2 improved significantly at 24, 48 and 72 hours in patients in OLAcompared with patients in ARDSnet protocol

Conclusion OLA improved oxygenation and driving pressure

OLA

Control

Days after randomization

10 20 30 40 50 600

50

60

70

80

90

100

Su

rviv

ed

patien

ts (

%)

Figure 4: OLA was associated with better survival (with no statistically

significanant difference) in this pilot study, but a large, randomized

controlled trial should be performed to compare outcomes between

OLA and the ARDSnet protocol


How large is the lung recruitability in early acute respiratory distress syndrome: aprospective case series of patients monitored by computed tomography

de Matos GF, Stanzani F, Passos RH, Fontana MF, Albaladejo R, Caserta RE, Santos DC, Borges JB, Amato MB,Barbas CSCrit Care. 2012 Jan 8;16(1):R4PMID 22226331, http://www.ncbi.nlm.nih.gov/pubmed/22226331

Design Prospective interventional study: Maximal recruitment strategy (MRS) staircase RM (recruitment maneuver) up to 45 cmH2O

Patients 51 early severe ARDS patients

Objectives Describes the effects of maximal recruitment strategy

Main Results The opening plateau-pressure was 60 ±6 cmH2O. Mean PaO2/FiO2 ratio increased from 125 ±43 to 300 ±103 after RM and was sustained above 300 throughout seven days. Non-aerated parenchyma decreased significantly from 54% [42-62] to 13% [5-24] RM. Thepotentially recruitable lung was estimated at 45% [25-53]. ICU mortality = 28% and hospitalmortality = 33%.

Conclusion MRS reversed hypoxemia and most of the collapsed lung tissue during the early stages ofARDS.

Nu

mb

er

of

Patien

ts

12

10

8

6

4

2

00 10 20 30 40 50 60 70 80

Amount of Potientially Recruitable Lung (% total lung weight)

No

n-a

era

ted L

ung T

issu

e(%

of

tota

l lu

ng m

ass

)

80

60

40

20

0

BaselinePEEP (˜10)

MaximumPEEP

TitratedPEEP (˜25)

Figure 5: RM followed by PEEP titration allowed a decrease of non-

aerated tissue. Potential for recruitment is variable among ARDS

patients and seems higher in early onset ARDS patients (grey his-

togram) than late ARDS patients (dashed lines)


Optimal duration of a sustained inflation recruitment maneuver in ARDS patients

Arnal JM, Paquet J, Wysocki M, Demory D, Donati S, Granier I, Corno G, Durand-Gasselin JIntensive Care Med. 2011 Oct;37(10):1588-94PMID 21858522, http://www.ncbi.nlm.nih.gov/pubmed/21858522

Design Prospective interventional study: 30 seconds sustained inflation at 40 cmH2O

Patients 50 early ARDS patients

Objectives Measure the dynamics of recruitment and the hemodynamic status during RM (recruitmentmaneuver)

Main Results The average volume increase was 210 ±198 ml. Time constant was 2.3 ±1.3 s. Systolic andmean arterial pressures were maintained at 10 s, decreased significantly at 20 and 30 s during the RM, and recovered to the pre-RM value 30 s after the end of the RM. Heartrate, diastolic arterial pressure, and SpO2 did not change during or after the RM.

Conclusion Most of the recruitment occured during the first 10 s and hemodynamic impairment was significant after 10 s = The optimal duration of RM by sustained inflation is around 10 s

0 5

Time (s)

10 15 20 25 30

800

1000

600

400

200

0

VR

M (m

L)

Figure 6: Individual curves of sustained inflation showed that 10

seconds were sufficient to achieve the maximal increase in volume


Prone position and recruitment manoeuvre: the combined effect improves oxygenation

Rival G, Patry C, Floret N, Navellou JC, Belle E, Capellier GCrit Care. 2011 May;15(3):R125PMID 21575205, http://www.ncbi.nlm.nih.gov/pubmed/21575205

Design Prospective interventional study: Each patient was ventilated 6h in both the supine position(SP) and the prone position (PP). A 45 cmH2O extended sigh in PC was performed at thebeginning of SP RM1 (recruitment maneuver), one hour after turning to the PP (RM2) and atthe end of the 6h PP period (RM3).


Objectives Study the effects on oxygenation of both RM and PP

Main Results Improvements in PaO2 level and PaO2/FiO2 ratio were transient in SP but durable during PP.PaO2/FiO2 changes were significant only after RM3. This global strategy had a benefit with regard to oxygenation: PaO2/FiO2 ratio increased from 98 mmHg to 166 mmHg 13 hours later at the end of the study. Pplat (plateau pressure) at decreased aftereach RM and over the entire PP period.

Conclusion Combined RM and PP increased oxygenation

Comment This RM method is associated with high VT with a risk of volutrauma.

End-inspiratory pauseat 45 cm H2O

PEEP

30 s

PIP 30 cm H2O

PIP 35 cm H2O

PIP 40 cm H2O

PIP 45 cm H2O

Figure 7: Recruitment protocol in pressure control ventilation:

increase of Pinsp by 5 cmH2O every 30s, to 45 cmH2O; then a 30 s

pause is performed; then Pisnp is decrease by 5 cmH2O every 30 s to

baseline.


Clinical efficacy and safety of recruitment maneuver in patients with acute respiratorydistress syndrome using low tidal volume ventilation: a multicentre randomizedcontrolled clinical trial

Xi XM, Jiang L, Zhu B; RM groupChin Med J. 2010 Nov;123(21):3100-5PMID 21162963, http://www.ncbi.nlm.nih.gov/pubmed/21162963

Design Multicenter RCT: 40 seconds sustained inflation at 40 cmH2O/8 h during 5 days versus noRM (recruitment maneuver)

Patients 110 ARDS patients

Objectives Evaluate the clinical efficacy and safety of RM

Main Results In the RM group the PaO2/FiO2 was increased compared to baseline on day one and day two(P = 0.007 and P = 0.001). There were no significant differences in hospital mortality, 28-daymortality and ventilator-free days at day 28. ICU mortality (32.7% vs. 52.7%), the rate ofsurvival with unassisted breathing for at least 48 consecutive hours at day 28 (58.2% vs.36.2%) and nonpulmonary organ failure-free days at day 28 (17 ±11 vs. 13 ±12) favored the RM group.

Conclusion RM had beneficial impact on clinical outcome

1,0

0,8

0,6

0,4

0,2

04 8 12

Time (days)

16 20 24 28

Cum

surv

ival

Control groupRM groupControl group-censoredRM group-censored

Figure 8: RM increased survival in ARDS patients


A recruitment maneuver increases oxygenation after intubation of hypoxemic intensivecare unit patients: a randomized controlled study

Constantin JM, Futier E, Cherprenet AL, Chanques G, Guerin R, Cayot-Constantin S, Jabaudon M, Perbet S,Chartier C, Jung B, Guelon D, Jaber S, Bazin JECrit Care. 2010 Apr;14(2):R76PMID 20426859, http://www.ncbi.nlm.nih.gov/pubmed/20426859

Design RCT: 30 seconds sustained inflation at 40 cmH2O versus no RM (recruitment maneuver)

Patients 40 patients intubated for acute hypoxemic respiratory failure

Objectives Evaluate the efficacy and safety of RMs performed immediately after intubation

Main Results 5 min after intubation, PaO2 obtained under 100% FiO2 was significantly higher in the RMgroup compared with the control group (93 ±36 vs 236 ±117 mmHg). The difference remained significant at 30 minutes with 110 ±39 and 180 ±79 mmHg, respectively, for thecontrol and RM groups. RM was not associated with increased adverse effects.

Conclusion RM following intubation in hypoxemic patients improved oxygenation

PaO2 (mmHg)

Recruitment Maneuvergroup

Inclusion TI 5 min after TI 30 min after TI

500

450

400

350

300

250

200

150

100

50

0

Figure 9: RM after intubation increased oxygenation, and oxygena-

tion remained high after 30 min


Reversibility of lung collapse and hypoxemia in early acute respiratory distresssyndrome

Borges JB, Okamoto VN, Matos GF, Caramez MP, Arantes PR, Barros F, Souza CE, Victorino JA, Kacmarek RM,Barbas CS, Carvalho CR, Amato MBAm J Respir Crit Care Med. 2006 Aug 1;174(3):268-78PMID 16690982, http://www.ncbi.nlm.nih.gov/pubmed/16690982

Design Prospective interventional study: Maximal recruitment strategy, staircase RM (recruitmentmaneuver) up to 45 cmH2O


Objectives Test if RM is clinically applicable in early ARDS

Main Results There was an improvment in oxygenation and reduction in the percent mass of collapsed tissue between Paw (airway pressure) = 40 and 60 cmH2O.

Conclusion In early ARDS it was possible to open the lung in the majority of patients

50%

40%

30%

Perc

ent

of

patients

fully

recr

uited (n=

24)

20%

10%

0%

40P

PLAT:

45 50 55 60

(assessement performed at PEEP = 25cmH2O)

Figure 10: Some patients needed Pplat (plateau pressure) =

60cmH2O to full recruitment


Lung recruitment in patients with the acute respiratory distress syndrome

Gattinoni L, Caironi P, Cressoni M, Chiumello D, Ranieri VM, Quintel M, Russo S, Patroniti N, Cornejo R, BugedoGN Engl J Med. 2006 Apr 27;354(17):1775-86PMID 16641394, http://www.ncbi.nlm.nih.gov/pubmed/16641394

Design Prospective interventional study: PC with Pplat (plateau pressure) = 45 cmH2O


Objectives Examine the relationship between the percentage of potentially recruitable lung and the clinical and physiological effects of RM (recruitment maneuver)

Main Results Patients with a higher percentage of potentially recruitable lung had greater total lungweights, poorer oxygenation, lower Crs (compliance of respiratory system), higher levels ofdead space and higher rates of death than patients with a lower percentage of potentially recruitable lung.

Conclusion In ARDS, the percentage of potentially recruitable lung is extremely variable and is stronglyassociated with the response to PEEP

Comment PEEP was not set according to recruitability. Setting low PEEP in patient with high potential of recruitable lung increases VILI and mortality.

HigherLower

24

22

20

18

26

14

12

10

8

6

4

2

0

-10

to -5

-5 to

0

0 to

5

5 to

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10 to

15

15 to

20

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25

25 to

30

30 to

35

35 to

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40 to

45

45to

50

50 to

55

55 to

60

60 to

65

65 to

70

70 to

75

75 to

80

No

. o

f Patien

ts

Patients with ARDS

Patients with acute lunginjury without ARDS

21±10%5±4%

Amount of Potentially Recruitable Lung (% total lung weight)

50

60

30

40

10

0

20

Mo

rtalit

y (%

)

Quartile 1(-9.2 to 5.7%)

Quartile 2(5.8 to 9.4%)

Quartile 3(-9.5 to 18.6%)

Quartile 4(-18.7 to 59.3%)

Figure 11: The potential of recruitability is different from patient to

patient in ARDS. The patient with the highest potential of recruitabil-

ity are those with the worst prognosis


Lung computed tomography during a lung recruitment maneuver in patients withacute lung injury

Bugedo G, Bruhn A, Hernández G, Rojas G, Varela C, Tapia JC, Castillo LIntensive Care Med. 2003 Feb;29(2):218-25PMID 12536272, http://www.ncbi.nlm.nih.gov/pubmed/12536272

Design Prospective interventional study: Staircase RM (recruitment maneuver) up to 30-40 cmH2O


Objectives Assess the acute effect of a RM on lung morphology

Main Results Poorly aerated and non-aerated tissue at PEEP 10 cmH2O = 60 ±9% of lung parenchyma, 1±2% was hyperinflated. Increasing PEEP to 20 and 30 cmH2O, compared to PEEP 10cmH2O, decreased poorly aerated and non-aerated tissue by 16 ±28% and 33 ±14%.Hyperinflated tissue increased up to 3 ±4% with PEEP 30 cmH2O.

Conclusion RM recruited collapsed alveoli without inducing too much hyperinflation

120

Volu

me (m

l)

40

60

80

100

20

0

10

exp.

exp.insp.insp.

insp. Hyperinflated tissue(-1000 to -901 HU)

Normal aerated tissue(-900 to -501 HU)

Poorly aerated tissue(-500 to -101 HU)

Non aerated tissue(-101 to +100 HU)

exp.

20 30PEEP level (cmH2O)

Figure 12: Increasing PEEP, decreased the non aerated tissue without

increase of hyperinflated tissue


Effects of recruiting maneuvers in patients with acute respiratory distress syndromeventilated with protective ventilatory strategy

Grasso S, Mascia L, Del Turco M, Malacarne P, Giunta F, Brochard L, Slutsky AS, Marco Ranieri VAnesthesiology. 2002 Apr;96(4):795-802PMID 11964585, http://www.ncbi.nlm.nih.gov/pubmed/11964585


Patients 22 ARDS patients. Patients were classified as responders and nonresponders on the occurrence of a 50% increase in PaO2/FiO2

Objectives Assess the influence of the elastic properties of the lung and chest wall on the effectivenessof a RM (recruitment maneuver).

Main Results RM increased PaO2/FiO2 by 20 ±3% in nonresponders (n = 11) and by 175 ±23% (n = 11) in responders. El (elastance of lung) and Ecw (elastance of chest wall) were higher innonresponders. Cardiac output and mean arterial pressure decreased by 31 ±2 and 19 ±3%in nonresponders and by 2 ±1 and 2 ±1% in responders.

Conclusion RM improved oxygenation and was well tolerated in patients who do not have impairment ofchest wall mechanics

Non-Responders500

100

PaO2/FiO

500

100

PaO2/FiO

Responders

Figure 13: Some patients increased SpO2 during RM, they were

called "Responders" and the others didn't increase SpO2, the "Non-

responders"


Effect of Intraoperative High Positive End-Expiratory Pressure (PEEP) With RecruitmentManeuvers vs Low PEEP on Postoperative Pulmonary Complications in Obese Patients:A Randomized Clinical Trial

Writing Committee for the PROBESE Collaborative Group of the PROtective Ventilation Network (PROVEnet) forthe Clinical Trial Network of the European Society of Anaesthesiology, Bluth T, Serpa Neto A, Schultz MJ, PelosiP, Gama de Abreu MJAMA. 2019 Jun 18;321(23):2292-2305PMID 31157366, http://www.ncbi.nlm.nih.gov/pubmed/31157366

Design Multicenter randomized controlled trial: 77 sites, 23 countries

Patients 2013 adults with BMI of 35 or greater and substantial risk for postoperative pulmonary complications who were undergoing noncardiac, nonneurological surgery under generalanesthesia

Objectives Determine whether a higher level of PEEP (PEEP = 12 cmH2O) with alveolar recruitmentmaneuvers (stepwise increase of tidal volume and eventually PEEP) decreases postoperativepulmonary complications compared with a lower level of PEEP (4 cmH2O).

Main Results The primary outcome was a composite of pulmonary complications within the first 5 postop-erative days, including respiratory failure, acute respiratory distress syndrome, bronchospasm,new pulmonary infiltrates, pulmonary infection, aspiration pneumonitis, pleural effusion,atelectasis, cardiopulmonary edema, and pneumothorax. It occurred in 21.3% in the highlevel of PEEP group compared with 23.6% in the low level of PEEP group (p = 0.23).

Conclusion Among obese patients undergoing surgery under general anesthesia, an intraoperativemechanical ventilation strategy with a high level of PEEP and recruitment maneuvers withoutprior recruitability assessment did not reduce postoperative pulmonary complications.

Comment Recruitment potential was not assessed before performing the recruitment maneuvers.


Recruitment maneuvers: using transpulmonary pressure to help Goldilocks

Baedorf Kassis E, Loring S, Talmor D.Intensive Care Med. 2017 Aug;43(8):1162-1163PMID 28386726, http://www.ncbi.nlm.nih.gov/pubmed/28386726

Design Post hoc analysis of EPVent study

Patients 28 patients

Objectives Measure the change in lung elastance during recruitment: A decrease in elastance of lung (negative ∆EL ) was considered evidence of recruitment and an increase in elastance of lung (positive ∆EL ) evidence of overdistension.

Main Results Recruited volume was dependent on transpulmonary pressure during the maneuver and inversely dependent on ∆EL (elastance of lung): - ∆EL was positive during recruitment in patients with PL,RM (peak transpulmonary pressure) ≥ 20 cmH2O - ∆EL was negative when PL,RM was between 10 and 20 cmH2O - ∆EL was negligible in patients with PL,RM below 10 cmH2O

Conclusion The optimal peak transpulmonary pressure during recruitment, where pressure expands thelung, optimizes elastance, and avoids overdistension, is between 10 and 20 cmH2O.

Comment Transpulmonary pressure helps to determine the pressure that is efficient and safe to performa recruitment maneuver.


Impact of recruitment on static and dynamic lung strain in acute respiratory distresssyndrome

García-Prieto E, López-Aguilar J, Parra-Ruiz D, Amado-Rodríguez L, López-Alonso I, Blázquez-Prieto J, Blanch L,Albaiceta GMAnesthesiology. 2016 Feb;124(2):443-52PMID 26569171, http://www.ncbi.nlm.nih.gov/pubmed/26569171

Design Animal study and prospective physiological study

Patients 6 oleic acid-injured pigs and 6 patients with moderate-to-severe ARDS

Objectives Clarify the role of recruitment in strain measurements defined as the ratio between end-inspiratory volume and functional residual capacity

Main Results In the animal model, recruitment caused a significant decrease in dynamic strain (p<0.01),while increasing the static component. In patients, total strain remained constant for thethree ventilatory settings. Increases in tidal volume had no significant effects. Increasing PEEPconstantly decreased dynamic strain (p<0.05) and increased static strain (p<0.05). Thechanges in dynamic and total strain among patients were correlated to the amount of recruited volume.

Conclusion Recruitment causes a shift from dynamic to static strain in early acute respiratory distress syndrome


Volume delivered during recruitment maneuver predicts lung stress in acute respiratorydistress syndrome

Beitler JR, Majumdar R, Hubmayr RD, Malhotra A, Thompson BT, Owens RL, Loring SH, Talmor DCrit Care Med. 2016 Jan;44(1):91-9PMID 26474111, http://www.ncbi.nlm.nih.gov/pubmed/26474111

Design EPVent substudy


Objectives Determine whether the volume delivered during a recruitment maneuver (VRM), consisting of sustained inflation at 40 cmH2O for 30 s, is inversely associated with lung stressand mortality in acute respiratory distress syndrome

Main Results VRM ranged between 7.4 and 34.7 ml/kg predicted body weight. Lower VRM predicted highend-inspiratory and tidal lung stress. Low VRM was also associated with an increased risk ofdeath.

Conclusion Low VRM predicted high lung stress and may predict risk of death in patients with acute respiratory distress syndrome

Comment This study used VRM to assess the maximum size of the aerated lung to establish the potential recruitability

Sigh in supine and prone position during acute respiratory distress syndrome

Pelosi P, Bottino N, Chiumello D, Caironi P, Panigada M, Gamberoni C, Colombo G, Bigatello LM, Gattinoni LAm J Respir Crit Care Med. 2003 Feb 15;167(4):521-7PMID 12493644, http://www.ncbi.nlm.nih.gov/pubmed/12493644

Design Prospective interventional study: 3 sighs/min


Objectives Evaluate recruitment in supine and prone position

Main Results Sighs increased PaO2 in both supine and prone position. The highest values of PaO2 andEELV (end-expiratory lung volume) occurred with the addition of sighs in prone and remainedsignificantly elevated 1 hour after discontinuation of the sighs. The increase in PaO2 associated with the sighs, both in supine and prone position, correlated linearly with theincrease of EELV.

Conclusion RM (recruitment maneuver) during ventilation in the prone position provided optimal lung recruitment


Maximal Recruitment Open Lung Ventilation in Acute Respiratory Distress Syndrome(PHARLAP): A Phase II, Multicenter, Randomized, Controlled Trial

Hodgson CL, Cooper DJ, Arabi Y, King V, Bersten A, Bihari S, Brickell K, Davies A, Fahey C, Fraser J, McGuinnessS, Murray L, Parke R, Paul E, Tuxen D, Vallance S, Young M, Nichol A; PHARLAP Study Investigators and the ANZ-ICS Clinical Trials GroupAm J Respir Crit Care Med. 2019 Jul 29PMID 31356105, http://www.ncbi.nlm.nih.gov/pubmed/31356105

Design Phase II multicenter, randomized, controlled trial: Patients received either maximal lungrecruitment, titrated positive end-expiratory pressure (PEEP) and tidal volume limitation, orcontrol 'protective' ventilation: 35 ICUs in 5 countries

Patients 115 patients with acute respiratory distress syndrome (ARDS) (planned 340 patients) betweenOctober 2012 and September 2017

Objectives Determine whether a maximal lung recruitment strategy reduces ventilator-free days in ARDSpatients

Main Results Enrolment was halted on 2 October, 2017 following publication of the Alveolar RecruitmentTrial, when 115 of a planned 340 patients had been randomized. There were no differencesin ventilator-free days, mortality, or barotrauma between groups. In the intervention groupthere was reduced use of hypoxemic adjuvant therapies (inhaled nitric oxide, extracorporealmembrane oxygenation, prone position),

Conclusion Maximal lung recruitment without prior assessment of recruitability did not reduce the duration of ventilator-free days or mortality.

Comment Recruitment potential was not assessed before the recruitment maneuvers were performed.The study was stopped early and enrolment was very slow.

0 50 100 150 200

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0.25

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rviv

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babili

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PHARLAP

Control

P = 0.62Figure 14: Kaplan-Meier curve shows no difference in survival

between the groups.


Opening pressures and atelectrauma in acute respiratory distress syndrome

Cressoni M, Chiumello D, Algieri I, Brioni M, Chiurazzi C, Colombo A, Colombo A, Crimella F, Guanziroli M,Tomic I, Tonetti T, Luca Vergani G, Carlesso E, Gasparovic V, Gattinoni LIntensive Care Med. 2017 May;43(5):603-611PMID 28283699, http://www.ncbi.nlm.nih.gov/pubmed/28283699

Design Bicenter prospective study

Patients 33 ARDS: 5 mild, 10 moderate, 9 severe without ECMO, 9 severe with ECMO

Objectives Measure the recruitment at different PEEP and plateau pressures

Main Results The ratio of lung tissue which opened between 30 and 45 cmH2O increased with the severityof the disease between 10 ±29 and 185 ±134 g (p < 0.05). The intratidal collapses were similar at a PEEP level of 5 cmH2O and 15 cmH2O, regardless of the severity.Increasing the applied airway pressure up to 45 cmH2O decreased the lung inhomogeneity inmild and moderate ARDS, but not in severe ARDS.

Conclusion Patients with the most severe ARDS are the most recruitable. For effective recruitment, air-way pressures higher than 30 cmH2O are required.

Airway Pressure (cmH2O)

0 5 10 15 20 25 30 35 40 45

0

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uited lung t

issu

e (g) Figure 15: Light gray: mild ARDS; Dark blue: moderate ARDS; Light

blue: severe ARDS without ECMO, Dark gray: severe ARDS with

ECMO. The more severe the ARDS, the more recruitable the lungs


A positive response to a recruitment maneuver with PEEP titration in patients withARDS, regardless of transient oxygen desaturation during the maneuver

Hodgson CL, Tuxen DV, Bailey MJ, Holland AE, Keating JL, Pilcher D, Thomson KR, Varma DJ Intensive Care Med. 2011 Jan-Feb;26(1):41-9PMID 21262752, http://www.ncbi.nlm.nih.gov/pubmed/21262752

Design Prospective interventional study: Staircase RM (recruitment maneuver) up to 40 cmH2O

Patients 20 early ALI patients

Objectives Evaluate the safety and the respiratory and hemodynamic effects of a staircase RM

Main Results There were significant improvements in shunt fraction, oxygen saturation (93% ±2% to 97%±3%), PaO2, PaO2/FiO2, Crs (compliance of respiratory system), and chest x-ray after theRM. 80% of the patients responded and the response was maintained at 1 hour. 8 patientsdesaturated 6% ±3% in SpO2 during the RM but 5 of those improved SpO2 relative to base-line by the end of the RM.

Conclusion Most patients with early ALI responded to the RM. Desaturation during the RM did not indicate a failed response 1 h later.

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20 20 19 16 20 20 18 16 12N

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Time (min)

Figure 16: Staircase recruitment maneuver protocol: Increase of PEEP

by 10 cmH2O to 40cmH2O, step = 2min; decrease by 2,5 cmH2O,

step = 3 min until SpO2 decrease


Safety and efficacy of a sustained inflation for alveolar recruitment in adults withrespiratory failure

Lapinsky SE, Aubin M, Mehta S, Boiteau P, Slutsky ASIntensive Care Med. 1999 Nov;25(11):1297-301PMID 10654217, http://www.ncbi.nlm.nih.gov/pubmed/10654217

Design Prospective interventional study: 20 seconds sustained inflation at 30 to 45 cmH2O

Patients 14 patients with hypoxemic respiratory failure

Objectives Assess the safety and efficacy of a 20 second sustained inflation

Main Results Significant improvement in oxygenation occurred in the majority of patients within 10 min.The mean SpO2 improved from 87 ±5 to 94 ±2%. Hypotension and mild oxygen desaturation occurred in some patients during the 20-s inflation, reversing rapidly after inflation was terminated.

Conclusion Sustained inflation is a safe, clinically applicable RM (recruitment maneuver) that improvesoxygenation

Prerecruitment Immediate 10 min 4 hr

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95

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Sp

O2

Figure 17: SpO2 increased during the RM and remained higher than

baseline after the RM


Changes in shunt, ventilation/perfusion mismatch, and lung aeration with PEEP inpatients with ARDS: a prospective single-arm interventional study

Karbing DS, Panigada M, Bottino N, Spinelli E, Protti A, Rees SE, GattinoniLCrit Care. 2020 Mar 23;24(1):111PMID 32293506, http://www.ncbi.nlm.nih.gov/pubmed/32293506

Design Preliminary study: patients were subjected to recruitment maneuvers (90 s in pressure-controlmode (PCV) with plateau pressure (Pplat) 45 cmH2O) followed by setting PEEP at 5 and theneither 15 or 20 cmH2O


Objectives Investigate the association between changes in shunt, low and high ventilation/perfusion (V/Q) mismatch, and computed tomography-measured lung aeration following an increase inPEEP in patients with ARDS

Main Results Increasing PEEP resulted in reduced values of pulmonary shunt and the percentage of non-aerated tissue, and an increased percentage of normally aerated tissue (p < 0.05). Changes inshunt and normally aerated tissue were correlated. Three distinct responses to increase inPEEP were observed in values of shunt and V/Q mismatch: a beneficial response in sevenpatients, where shunt decreased without increasing high V/Q; a detrimental response in fourpatients where both shunt and high V/Q increased; and a detrimental response in onepatient with reduced shunt but increased high V/Q mismatch. Non-aerated tissue decreasedwith increased PEEP in all patients, and hyperinflated tissue increased only in patients with adetrimental response in shunt and V/Q mismatch.

Conclusion Improved lung aeration following an increase in PEEP is not always consistent with reducedshunt and V/Q mismatch. Poorly matched redistribution of ventilation and perfusion betweendependent and non-dependent regions of the lung may explain why patients showed detrimental changes in shunt and V/Q mismatch on increase in PEEP despite improved aeration.


Bedside assessment of the effects of positive end-expiratory pressure on lung inflationand recruitment by the helium dilution technique and electrical impedancetomography

Mauri T, Eronia N, Turrini C, Battistini M, Grasselli G, Rona R, Volta CA, Bellani G, Pesenti AIntensive Care Med. 2016 Oct;42(10):1576-87PMID 27518321, http://www.ncbi.nlm.nih.gov/pubmed/27518321

Design Prospective randomized crossover study

Patients 20 patients; 12 with acute hypoxemic respiratory failure and 8 with acute ARDS

Objectives Measure PEEP-related lung volume changes by EIT (electrical impedance tomography) and bythe helium dilution technique

Main Results PEEP-induced changes in lung inflation and recruitment measured by electrical impedancetomography and helium dilution showed close correlation (r2=0.78, p<0.001 and r2=0.68, p<0.001, respectively) but with relatively variable limits of agreement. At higherPEEP, recruitment was evident in all lung regions (p<0.01) and heterogeneity of tidal ventilation distribution was reduced by increased tidal volume distending the dependent lung(p<0.001); in the non-dependent lung, compliance decreased (p<0.001) and tidal hyperinfla-tion significantly increased (p<0.001). In the subgroup of ARDS patients tidal hyperinflation inthe dependent lung regions decreased at higher PEEP (p=0.05), probably indicating higher potential for recruitment.

Conclusion A high level of PEEP exerts mixed effects on the regional determinants of VILI (ventilator- induced lung injury)


Lung recruitment assessed by respiratory mechanics and computed tomography inpatients with acute respiratory distress syndrome. What is the relationship?

Chiumello D, Marino A, Brioni M, Cigada I, Menga F, Colombo A, Crimella F, Algieri I, Cressoni M, Carlesso E,Gattinoni L.Am J Respir Crit Care Med. 2016 Jun 1;193(11):1254-63PMID 26699672, http://www.ncbi.nlm.nih.gov/pubmed/26699672

Design Prospective interventional study


Objectives Determine recruitment measured by respiratory mechanics (PV curve and compliance) is comparable with recruitment measured by computed tomography

Main Results Recruitment measured by PV curve was 54 ±28% and 39 ±25% using compliance of the gasvolume at 5 cmH2O of PEEP. Recruitment measured by CT scan as not inflated tissue was 5 ±5% and 6 ±6% if we consider not and poorly inflated tissue, on the total lungtissue.

Conclusion Respiratory mechanics and CT measured two different entities. The respiratory mechanics-based methods included gas entering in already open pulmonary units that improve theirmechanical properties (used to assess the overall improvement of inflation). The CT scanmeasured the amount of collapsed tissue that regains inflation.


Dynamics of end expiratory lung volume after changing positive end-expiratorypressure in acute respiratory distress syndrome patients

Garnero A, Tuxen D, Corno G, Durand-Gasselin J, Hodgson C, Arnal JMCrit Care. 2015 Sep 18;19:340PMID 26383835, http://www.ncbi.nlm.nih.gov/pubmed/26383835


Patients 26 early onset moderate to severe ARDS patients

Objectives Measure the dynamics of end-expiratory lung volume changes during an increase and decrease in PEEP between 5 and 40 cmH20 by steps of 5 cmH20 to determine the optimal duration for each step during an SRM

Main Results During the increase in PEEP, the expected increased volume (respiratoy system compliance by the increase in pressure) was achieved within 2 [2-2] breaths and 95% of theadditional increased volume (total end expiratory volume change minus expected increasedvolume) was achieved within 13 [6–16] breaths. During the decrease in PEEP, the expecteddecreased volume was achieved within 1 [1-1] breath, and 95 % of the additional decreased volume was achieved within 8 [2-15] breaths.

Conclusion In early ARDS, most of the end expiratory volume change occured within the first minute

Acute physiologic effects of a stepwise recruitment maneuver in acute respiratorydistress syndrome

Morán I, Blanch L, Fernández R, Fernández-Mondéjar E, Zavala E, Mancebo JMinerva Anestesiol. 2011 Dec;77(12):1167-75PMID 21623343, http://www.ncbi.nlm.nih.gov/pubmed/21623343

Design Prospective interventional study: Staircase RM (recruitment maneuver)up to 40 cmH2O


Objectives Assess the clinical impact of RM

Main Results 2 h after the RM, the PaO2/FiO2 was higher than at baseline (187 ±102 versus 339 ±136 mmHg). The RM was discontinued due to severe complications in four patients: 3 for CO2 decrease, 1 for hypotension, 1 for supraventricular tachycardia.

Conclusion Staircase RM should be applied carefully and closely monitored


Acute hemodynamic effects of recruitment maneuvers in patients with acuterespiratory distress syndrome

Park KJ, Oh YJ, Chang HJ, Sheen SS, Choi J, Lee KS, Park JH, Hwang SCJ Intensive Care Med. 2009 Nov-Dec; 24(6):376-82PMID 19846416, http://www.ncbi.nlm.nih.gov/pubmed/19846416



Objectives Evaluated circulatory and cardiac changes during RM (recruitment maneuver)

Main Results Mean, systolic, and diastolic blood pressure decreased at 20 and 30 seconds during RM(mean blood pressure: 92 ±12 at baseline to 83 ±18 mmHg at the end of the RM) and subsequently recovered. Heart rate decreased at 10 and 20 seconds during the RM, andtended to increase afterward. Both ventricular dimensions decreased significantly during theRM. The left ventricular ejection fraction and peak velocity of the left ventricle during systoleremained stable. The fractional changes in mean BP (blood pressure)and left ventricular end-diastolic dimension were correlated.

Conclusion A transient decrease in mean BP was observed during the RM, and its degree was correlated with the preload decrease

Intercomparison of recruitment maneuver efficacy in three models of acute lung injury

Lim SC, Adams AB, Simonson DA, Dries DJ, Broccard AF, Hotchkiss JR, Marini JJCrit Care Med. 2004 Dec;32(12):2371-7PMID 15599138, http://www.ncbi.nlm.nih.gov/pubmed/15599138

Design Animal study: 40 seconds sustained inflation at 45 cmH2O, staircase RM (recruitmentmaneuver) and PC

Patients 28 pigs with VILI, oleic acid injury or pneumococcal pneumonia

Objectives Evaluate the hemodynamic consequence of 3 RM techniques

Main Results PC caused a lasting increase of PaO2 in the VILI model, but in oleic acid injury and pneumococcal pneumonia, there were no differences for any RM technique.

Conclusion The 3 RM techniques were equivalent in terms of oxygenation


Pediatric patients

Respiratory and hemodynamic effects of a stepwise lung recruitment maneuver in pediatricARDS: a feasibility study

Cruces P, Donoso A, Valenzuela J, Díaz FPediatr Pulmonol. 2013 Nov;48(11):1135-43PMID 23255291, http://www.ncbi.nlm.nih.gov/pubmed/23255291


Patients 25 pediatric early ARDS patients, age = 5 [1-16] months

Objectives Assess the effects on gas exchange and lung mechanics of RM in pediatric ARDS patients

Main Results 30 RM were performed, with all completed successfully. No airleaks developed. Mild hypotension was detected during 4 RM. Following RM, Crs (compliance of respiratory system), and PaO2/FiO2 increased without changes in PaCO2. Oxygenation improved at 12 and 24 hr. The 28-day mortality rate was 16%.

Conclusion RM were safe, well tolerated and improved lung function in children with ARDS

Cd

ym

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cmH

2O

/Kg

)

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Figure 18: Compliance decreased at high level of PEEP during RM but

increase during the decremental PEEP trial and was higher at the end

of the protocol than at baseline


The safety and efficacy of sustained inflations as a lung recruitment maneuver inpediatric intensive care unit patients

Duff JP, Rosychuk RJ, Joffe ARIntensive Care Med. 2007 Oct;33(10):1778-86PMID 17607560, http://www.ncbi.nlm.nih.gov/pubmed/17607560

Design Prospective interventional study: 15-20 seconds sustained inflation at 30-40 cmH2O was performed following a ventilator disconnection, suctioning, hypoxemia, or routinely every 12 h

Patients 32 pediatric patients aged from 11 days to 14 years

Objectives Assess the safety and efficacy of RM (recruitment maneuver) in pediatric patients

Main Results 7/93 RM (7.5%) were interrupted for patient agitation, and 2/93 (2.2%) for transient bradycardia. There was no change in systolic blood pressure, heart rate, or SpO2 from pre-RM to post-RM, and there were no air leaks. In 3 patients with altered intracranial compliance, 3/8 RM were associated with a spike of intracranial pressure. There was a sustained significant decrease in FiO2 by 6% lasting up to 6 h post-RM.

Conclusion RM was safe in pediatric patients


Comparison of 2 lung recruitment strategies in children with acute lung injury

Kheir JN, Walsh BK, Smallwood CD, Rettig JS, Thompson JE, Gómez-Laberge C, Wolf GK, Arnold JHRespir Care. 2013 Aug;58(8):1280-90PMID 23232733, http://www.ncbi.nlm.nih.gov/pubmed/23232733

Design Prospective, non-randomized, crossover pilot study: 40 seconds sustained inflation at 40cmH2O and staircase RM (recruitment maneuver) up to 35 cmH2O

Patients 10 pediatric ALI patients from 4 years to 17 years

Objectives Compare the acute effects of 2 RM strategies

Main Results Both methods were effective in raising PaO2 and FRC (functional residual capacity). Sustained inflation was associated with temporary desaturation. During the staircase RM,dead-space and PaCO2 increased, CO2 elimination and Crs decreased.

Conclusion Both methods were effective in raising PaO2 but staircase RM required caution about CO2

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Staircase RecruitmentStrategy

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O2 (m

mH

g)

PEEP Titration Observation

Art

erial pH

6.8

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Figure 19: PaCO2 increased and pH decreased during staircase

recruitment maneuver


Lung aeration changes after lung recruitment in children with acute lung injury: afeasibility study

Boriosi JP, Cohen RA, Summers E, Sapru A, Hanson JH, Gildengorin G, Newman V, Flori HRPediatr Pulmonol. 2012 Aug;47(8):771-9PMID 22298419, http://www.ncbi.nlm.nih.gov/pubmed/22298419

Design Case series: Staircase RM (recruitment maneuver)

Patients 6 pediatric ALI patients aged from 1 month to 15 years

Objectives Describe CT-scan lung aeration changes and gas exchange after RM in pediatric ALI patients

Main Results There was a variable increase in aerated and poorly aerated lung after the RM ranging from3% to 72% (20% [6-47]). All patients had improvement in PaO2 /FiO2 after the RM (14% [8-72]. 4/6 had a decrease in PaCO2. One subject had transient hypercapnia during theRM and this correlated with the smallest increase in aerated lung. All patients tolerated theRM without hemodynamic compromise, barotrauma, hypoxemia, or dysrhythmias.

Conclusion Lung recruitment resulted in improved lung aeration as detected by lung tomography, accompanied by improvements in oxygenation and ventilation

1 2 3 4 5 6 5 6 9 10 11 120

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CT-scan Opening pressure Recruitment

CT-scanClosingpressure

Figure 20: Pediatric staircase recruitment maneuver protocol. PEEP is

increased by 2 cmH2O every minute to critical opening pressure (PEEP

assiciated with the highest Crs) or Pinsp = 45 cmH2O. Then PEEP is

decreased by 2 cmH2O every minute to critical opening pressure

(PEEP assiciated with the highest Crs). After 2 min is spent at the criti-

cal opening pressure and PEEP is settled at critical opening pressure

+2 cmH2O.


Additional files

The Nature of Recruitment and Derecruitment and its Implications for Management of ARDS

Kallet RH, Lipnick MS, Burns GRespir Care. 2020 Oct 13:respcare.08280PMID 33051254, http://www.ncbi.nlm.nih.gov/pubmed/33051254

Design Review

Objectives This narrative review examines the evidence used to design RM (recruitment maneuver)strategies, with the radiologic, rheologic, and histopathologic evidence regarding the natureof lung injury, the phenomena of recruitment and derecruitment as it informs our percep-tions of recruitment potential in ARDS. Major clinical trial data are examined to assess thepractical necessity of RM in ARDS, and whether a subset of cases might benefit from pursuing RM therapy.

Conclusion A less radical approach to RM is offered that might achieve the goals of RM with less risk ofharm.

Recruitment maneuvers and higher PEEP, the so-called open lung concept, in patientswith ARDS

Van der Zee P, Gommers D.Crit Care. 2019 Mar 9;23(1):73.PMID 30850004, http://www.ncbi.nlm.nih.gov/pubmed/30850004

Design Review

Objectives Discuss the pathophysiology of ARDS and VILI (ventilator-induced lung injury), limitations andindications of the open lung concept, bedside monitoring to guide the open lung concept

Conclusion Open lung concept should be applied in patients with severe ARDS with refractory hypoxemia, but only if a patient is a responder to recruitment


Lung recruitment maneuvers for adult patients with acute respiratory distresssyndrome. A systematic review and meta-analysis.

Goligher EC, Hodgson CL, Adhikari NKJ, Meade MO, Wunsch H, Uleryk E, Gajic O, Amato MPB, Ferguson ND,Rubenfeld GD, Fan EAm Thorac Soc. 2017 Oct;14(Supplement_4):S304-S311PMID 29043837, http://www.ncbi.nlm.nih.gov/pubmed/29043837

Design Systematic review and meta-analysis

Objectives Summarize the current evidence in support of the use of RM (recruitment maneuver) in ARDSpatients

Main Results Meta-analysis of six trials suggested a mortality reduction (RR, 0.81; 95% CI, 0.69-0.95), animprovement of oxygenation and less frequent requirement for rescue therapy. RM were notassociated with an increased rate of barotrauma or with the rate of hemodynamic compro-mise.

Conclusion Randomized trials suggest that RM in combination with a higher PEEP ventilation strategyreduce mortality

Lung Recruitment Maneuvers for ARDS Patients: A Systematic Review and Meta-Analysis

Cui Y, Cao R, Wang Y, Li GRespiration. 2019 Jul 22:1-13PMID 31330508, http://www.ncbi.nlm.nih.gov/pubmed/31330508

Design Systematic review and meta-analysis

Objectives Determine whether lung recruitment maneuvers (LRMs) have benefits on ARDS patients

Conclusion This meta-analysis showed a significant benefit of LRMs for shortening the length of hospitalstay and improving the PaO2/FiO2 ratio.


Recruitment maneuvers and PEEP titration

Hess DRRespir Care. 2015 Nov;60(11):1688-704PMID 26493593, http://www.ncbi.nlm.nih.gov/pubmed/26493593

Design Review

Conclusion Principles and methods for recruitment and PEEP titration

Lung recruitment in acute respiratory distress syndrome: what is the best strategy?

Keenan JC, Formenti P, Marini JJCurr Opin Crit Care. 2014 Feb;20(1):63-8PMID 24335655, http://www.ncbi.nlm.nih.gov/pubmed/24335655

Design Review

Conclusion Why, when and how to perform RM (recruitment maneuver)

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Recruitment maneuvers for acute lung injury: a systematic review

Fan E, Wilcox ME, Brower RG, Stewart TE, Mehta S, Lapinsky SE, Meade MO, Ferguson NDAm J Respir Crit Care Med. 2008 Dec 1;178(11):1156-63PMID 18776154, http://www.ncbi.nlm.nih.gov/pubmed/18776154

Design Systematic review

Objectives Summarize the physiologic effects and adverse events of RM (recruitment maneuver)

Conclusion Oxygenation was significantly increased after an RM, there were no persistent, clinically significant changes in hemodynamic parameters after an RM. Hypotension and desaturation were the most common adverse events. Serious adverse events (barotrauma [1%] and arrhythmias [1%]) were infrequent.

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